I had an ELCS with ds1 because he was breech.
I also have a heart shaped uterus.
DS2 presented head down, and I wanted to try for VBAC.
The consultant said that previous section was a rupture risk, as is mis-shapen uterus. He put my odds at around 70% for successful VBAC. He then said but given that CS rate is 20%, your odds are not that much lower. He wanted CFM, for me to be admitted sooner rather than later when I went into labour and said they would possibly look at a CS sooner into labour if there were probs than they might otherwise.
So, I wrote in my birth plan that I wanted no CFM, no intervention unless totally neccessary, natural 3rd stage, water birth, erm can't remember what else.
And what happened was that i was in the birthing pool with occasional monitoring with the hand held doppler for around 3hrs. It was lovely! The midwife was concerned about the heart rate so asked me to get out. She examined me and I was 7cm, then she broke my waters. Things really got moving, and she was very insistent that I lie on the bed, despite my protests, but she did get me to lie on my side. The CFM started at this point. I had been pushing for a while when they said we have to intervene. Tried ventouse, no joy. Used forceps. It was close. They were in eyeing me up for an EMCS, but fortunately it wasn't neccessary.
So, although it wasn't the lovely natural birth that I had hoped for, I felt very good about having avoided another CS. The midwife said that had the heartrate not dropped, I would have delivered in about another 15mins. I did this all on G&A and overall was pleased with the outcome, and ds2 was none the worse for it.
Shortly before my due date, I read Ina May Gaskins Guide to Childbirth. Although there's not much in it about VBAC (mostly statistics IIRC) it gave me the confidence to give it a go.
Good luck!